<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="p.id" placeholder="商品ID" readonly><!--只读-->
  <input type="text" v-model="p.title" placeholder="商品标题">
  <input type="text" v-model="p.price" placeholder="商品价格">
  <input type="text" v-model="p.num" placeholder="商品库存">
  <input type="button" value="修改" @click="update()">
</div>

<!--引入axios和vue框架-->
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.6.14/vue.min.js"></script>
<script>
    let v = new Vue({
            el:"body>div",
            data:{
               p:{id:"",title:"",price:"",num:""}
            },
            methods: {
                update() {
                    /*发出修改的异步post请求*/
                    axios.post("/update", v.p).then(function (response) {
                        alert("修改完成");

                        location.href = "/list.html";
                    });

                }
            },
        created:function () {
                /*location.search 可以得到地址栏中?以后的内容(此处是 ?id=数字)*/
            axios.get("/selectById" + location.search).then(function (response) {
                v.p = response.data;
            });
        }


        })
</script>

</body>
</html>